2A672 Volume 2 Ure Part 2
Volume URE for 2A672 Volume 2
Questions and Answers
- 1.
What does the heat boost system on the ACE802S air conditioner use to trim output air temperature?
- A.
Air
- B.
Refrigerant
- C.
Engine coolant
- D.
Electric heater
Correct Answer
C. Engine coolantExplanation
The heat boost system on the ACE802S air conditioner uses engine coolant to trim the output air temperature. Engine coolant is a liquid that circulates through the engine to absorb heat and prevent overheating. By utilizing the engine coolant, the air conditioner can adjust the temperature of the output air to provide the desired level of heating.Rate this question:
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- 2.
What ACE 802S air conditioner components divide the refrigerant system high-pressure side from the low-pressure side?
- A.
Compressor and expansion valve
- B.
Condenser and expansion valve
- C.
Compressor and condenser
- D.
Condenser and evaporator
Correct Answer
A. Compressor and expansion valveExplanation
The compressor and expansion valve are the components that divide the refrigerant system high-pressure side from the low-pressure side. The compressor is responsible for compressing the refrigerant and increasing its pressure, while the expansion valve is responsible for regulating the flow of refrigerant into the evaporator, where it expands and cools down. Together, these components ensure that the high-pressure side and low-pressure side of the refrigerant system are separated, allowing for efficient cooling.Rate this question:
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- 3.
What ACE 802S air conditioner system "supercharges" the compressor?
- A.
Defrost
- B.
Heat boost
- C.
Vapor injection
- D.
Liquid injection
Correct Answer
C. Vapor injectionExplanation
Vapor injection is the ACE 802S air conditioner system that "supercharges" the compressor. This means that vapor injection technology is used in this system to enhance the performance of the compressor. By injecting vapor into the compressor, it helps to improve the cooling capacity and efficiency of the air conditioner. This technology allows the compressor to operate at higher pressures, resulting in improved cooling performance and energy efficiency.Rate this question:
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- 4.
What valve must be opened prior to starting the engine on the ACE 802S air conditioner system?
- A.
Air shutoff
- B.
Fuel shutoff
- C.
Coolant control
- D.
Refrigerant control
Correct Answer
A. Air shutoffExplanation
The valve that must be opened prior to starting the engine on the ACE 802S air conditioner system is the air shutoff valve. This valve allows air to flow into the system, which is necessary for the engine to start and function properly. By opening the air shutoff valve, the necessary air supply is provided to the engine, allowing it to start and run smoothly.Rate this question:
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- 5.
What is the first troubleshooting step that must be accomplished when a unit comes in with a write-up in the forms?
- A.
Perform a service inspection
- B.
Perform an operational check
- C.
Verify the problem actually exists
- D.
Recognize the write-up as a malfunction
Correct Answer
D. Recognize the write-up as a malfunctionExplanation
The first troubleshooting step that must be accomplished when a unit comes in with a write-up in the forms is to recognize the write-up as a malfunction. This means acknowledging that there is a reported issue or problem with the unit. By recognizing the write-up as a malfunction, the technician can then proceed with further troubleshooting steps to diagnose and address the specific problem.Rate this question:
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- 6.
What power source operates the heater/combustion section of the new generation heater (NGH)?
- A.
12 VDC
- B.
120 VAC
- C.
Hydraulic motor
- D.
Diesel engine only
Correct Answer
B. 120 VACExplanation
The heater/combustion section of the new generation heater (NGH) is operated by a 120 VAC power source. This means that the heater requires a standard electrical power supply of 120 volts alternating current to function properly.Rate this question:
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- 7.
How does the new generation heater (NGH) keep output air temperature within programmed limits?
- A.
Burner control unit (BCU) uses outlet air sensors to compare air temperature with programmed value, cycling the fuel burner on and off to maintain temperature
- B.
Heater control unit (HCU) uses outlet air sensors to compare air temperature with programmed value, cycling the fuel burner on and off to maintain temperature
- C.
A photocell monitors combustion and activates the BCU to cycle the fuel burner on and off to maintain temperature
- D.
An electronic thermostat cycles the main air fan on and off to maintain temperature
Correct Answer
B. Heater control unit (HCU) uses outlet air sensors to compare air temperature with programmed value, cycling the fuel burner on and off to maintain temperatureExplanation
The correct answer is that the heater control unit (HCU) uses outlet air sensors to compare air temperature with the programmed value, cycling the fuel burner on and off to maintain the temperature. This means that the HCU constantly monitors the outlet air temperature and adjusts the fuel burner accordingly to keep the temperature within the desired range. By cycling the fuel burner on and off, the HCU can effectively regulate the output air temperature and ensure it stays within the programmed limits.Rate this question:
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- 8.
What adjustment on the new generation heater (NGH) prevents coking in the combustion section?
- A.
Fuel pressure
- B.
Air/fuel ratio
- C.
Igniter timing
- D.
Fuel spray pattern
Correct Answer
B. Air/fuel ratioExplanation
The air/fuel ratio is the correct answer because it refers to the balance between the amount of air and fuel being mixed in the combustion section of the new generation heater (NGH). A proper air/fuel ratio ensures that there is enough oxygen for complete combustion of the fuel, preventing the formation of carbon deposits or coking. If the air/fuel ratio is too rich (excess fuel), it can lead to incomplete combustion and coking. On the other hand, if the ratio is too lean (excess air), it can cause high temperatures and potential damage to the heater. Therefore, maintaining the correct air/fuel ratio is crucial to prevent coking.Rate this question:
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- 9.
How does the photocell on the new generation heater (NGH) verify the flame in the burner tube?
- A.
The photocell's thermal contacts open when heat increases
- B.
The photocell's thermal contacts close when heat increases
- C.
The photocell's resistance decreases in the presence of light
- D.
The photocell's resistance increases in the presence of light
Correct Answer
C. The photocell's resistance decreases in the presence of lightExplanation
The photocell on the new generation heater (NGH) verifies the flame in the burner tube by detecting the presence of light. When light is present, the resistance of the photocell decreases. This change in resistance is used as a signal to indicate that the flame is present and functioning properly.Rate this question:
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- 10.
When troubleshooting a defective new generation heater (NGH) charging system, what component do you check first?
- A.
Charge coil
- B.
Alternator G1
- C.
Ignition switch
- D.
Charge regulator
Correct Answer
C. Ignition switchExplanation
When troubleshooting a defective new generation heater (NGH) charging system, the first component to check is the ignition switch. The ignition switch controls the flow of electricity to the charging system, so if it is faulty, it can prevent the NGH from charging properly. By checking the ignition switch first, you can determine if it is the cause of the problem and proceed with further troubleshooting if necessary.Rate this question:
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- 11.
What condition causes erratic operation of the MJ-2A-1 hydraulic test stand?
- A.
Air in the system
- B.
Fill relief valve set too low
- C.
Thermal relief valve set too high
- D.
Overserviced hydraulic reservoir
Correct Answer
A. Air in the systemExplanation
Air in the hydraulic system can cause erratic operation of the MJ-2A-1 hydraulic test stand. When air enters the system, it can create air pockets or bubbles that disrupt the flow of hydraulic fluid. This can result in inconsistent pressure and flow, leading to unpredictable operation of the test stand. To resolve this issue, it is necessary to bleed the air out of the system and ensure that it is properly filled with hydraulic fluid.Rate this question:
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- 12.
The system selector valve on the MJ-2A-1 hydraulic test stand must be placed in the AIRCRAFT position during fill-and-bleed operation in order to
- A.
Relieve pressure from the system
- B.
Force fluid to flow into the reservoir
- C.
Bypass fluid around the gear-type boost pump
- D.
Force fluid to flow into the low-pressure system
Correct Answer
D. Force fluid to flow into the low-pressure systemExplanation
The correct answer is "force fluid to flow into the low-pressure system." When the system selector valve is placed in the AIRCRAFT position during the fill-and-bleed operation, it allows the fluid to flow into the low-pressure system. This is necessary to ensure that the system is properly filled and any air or contaminants are bled out. Placing the valve in this position directs the fluid specifically to the low-pressure system, ensuring that it is properly pressurized and functioning correctly.Rate this question:
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- 13.
What MJ-2A-1 hydraulic test stand component prevents thermal expansion of the hydraulic fluid from rupturing a hydraulic line?
- A.
Heat exchanger
- B.
Temperature switch
- C.
Thermal relief valve
- D.
Low-pressure check/relief valve
Correct Answer
C. Thermal relief valveExplanation
The thermal relief valve is the component that prevents thermal expansion of the hydraulic fluid from rupturing a hydraulic line. Thermal expansion occurs when the temperature of the fluid increases, causing it to expand and potentially build up excessive pressure in the system. The thermal relief valve is designed to relieve this pressure by opening and allowing the excess fluid to escape, thus preventing any damage or rupture to the hydraulic line.Rate this question:
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- 14.
When fluid temperature is below 70 degrees F, what must be accomplished to prevent rupturing the filters on the MJ-2A-1 hydraulic test stand?
- A.
Fill-and-bleed the system
- B.
Adjust the thermal relief valve
- C.
Open the heat exchanger bypass valve
- D.
Close the heat exchanger bypass valve
Correct Answer
C. Open the heat exchanger bypass valveExplanation
To prevent rupturing the filters on the MJ-2A-1 hydraulic test stand when the fluid temperature is below 70 degrees F, the heat exchanger bypass valve should be opened. This is because opening the bypass valve allows the fluid to bypass the heat exchanger, which helps to prevent the fluid from becoming too cold and potentially causing damage to the filters. By opening the bypass valve, the fluid can flow directly through the system without being cooled by the heat exchanger, ensuring the filters are not at risk of rupturing.Rate this question:
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- 15.
What MJ-2A-1 test stand component must be readjusted any time the high-pressure pump compensator setting is changed?
- A.
High-pressure pump volume control
- B.
High-pressure relief valve
- C.
Thermal relief valve
- D.
Bypass valve
Correct Answer
B. High-pressure relief valveExplanation
The high-pressure relief valve must be readjusted any time the high-pressure pump compensator setting is changed. This is because the high-pressure relief valve is responsible for regulating the pressure in the system and preventing it from exceeding safe levels. When the compensator setting is changed, it affects the overall pressure in the system, and therefore the high-pressure relief valve needs to be readjusted to ensure that it is still functioning properly and maintaining the correct pressure levels.Rate this question:
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- 16.
What MJ-2A-1 hydraulic test stand component must be open to set the volume output?
- A.
Bypass valve
- B.
System selector valve
- C.
High-pressure relief valve
- D.
Heat exchanger bypass valve
Correct Answer
A. Bypass valveExplanation
To set the volume output of the hydraulic test stand, the bypass valve must be open. The bypass valve allows the fluid to bypass the main system and flow directly back to the reservoir. By adjusting the bypass valve, the volume of fluid flowing through the system can be controlled, thereby setting the desired output volume.Rate this question:
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- 17.
What MJ-2A-1 hydraulic test stand engine system safety device sounds the warning horn in the event of an engine system malfunction?
- A.
Water level switch
- B.
Oil pressure switch
- C.
Fuel level indicator
- D.
Fuel pressure switch
Correct Answer
B. Oil pressure switchExplanation
The oil pressure switch is responsible for monitoring the oil pressure in the engine system. In the event of an engine system malfunction, such as low oil pressure, the oil pressure switch will detect this and activate the warning horn to alert the operator. This safety device ensures that any issues with the engine system are quickly identified and addressed to prevent further damage or accidents.Rate this question:
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- 18.
What MJ-2A-1 hydraulic test stand switch provides an alternate means of energizeng the fill pump when either of the microswitches is defective?
- A.
Fill switch, LS4
- B.
Micro switch, FS1
- C.
Engine master switch
- D.
Soft start relay switch
Correct Answer
A. Fill switch, LS4Explanation
The fill switch, LS4, provides an alternate means of energizing the fill pump when either of the microswitches is defective. This means that if either of the microswitches fails, the fill switch can be used as a backup to activate the fill pump.Rate this question:
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- 19.
During MJ-2A-1 hydraulic test stand slosed loop operation, the aircraft reservoir began to drain and the operator immediately shuts the unit down to prevent any further fluid loss. By analyzing the hydraulic flow charts, you determine that the problem is caused by the thermal relief valve being set to
- A.
162 psi
- B.
152 psi
- C.
142 psi
- D.
132 psi
Correct Answer
D. 132 psiExplanation
The correct answer is 132 psi. The thermal relief valve is designed to relieve excess pressure in the hydraulic system to prevent damage. In this case, the reservoir began to drain, indicating that the pressure in the system was too high and causing fluid loss. By analyzing the hydraulic flow charts, it can be determined that the thermal relief valve was set to 132 psi, which was not sufficient to prevent the pressure from exceeding safe levels.Rate this question:
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- 20.
The maximum output pressure of the MHU-83C/E lift truck's hydraulic control valves is
- A.
775 psi
- B.
1,500 psi
- C.
1,800 psi
- D.
2,000 psi
Correct Answer
D. 2,000 psiExplanation
The correct answer is 2,000 psi. This means that the maximum output pressure of the MHU-83C/E lift truck's hydraulic control valves is 2,000 pounds per square inch. This indicates that the lift truck's hydraulic system is capable of generating significant force, allowing it to lift heavy loads efficiently.Rate this question:
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- 21.
During a load test of an MHU lift truck, the operator changes the level of the table by changing the position of the
- A.
Longitudinal valve
- B.
Tilt control valve
- C.
Latitudinal valve
- D.
Azimuth valve
Correct Answer
B. Tilt control valveExplanation
The correct answer is the tilt control valve. During a load test of an MHU lift truck, the operator changes the level of the table by adjusting the position of the tilt control valve. This valve controls the angle of the lifting mechanism and allows the operator to tilt the table forwards or backwards to adjust the position of the load. By changing the position of the tilt control valve, the operator can ensure that the load is properly balanced and positioned for safe and efficient lifting and transporting.Rate this question:
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- 22.
The MHU lift truck is operating at governed speed, but the directional control lever is stuck. What is the cause of this trouble?
- A.
Shifter solenoid is energized
- B.
Neutral switch S2 is still open
- C.
Shifter solenoid is de-energized
- D.
Directional lever is out of adjustment
Correct Answer
C. Shifter solenoid is de-energizedExplanation
The correct answer is "shifter solenoid is de-energized". This means that the solenoid responsible for controlling the shifting of the directional control lever is not receiving power or has lost power. As a result, the lever is stuck and unable to change direction.Rate this question:
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- 23.
During load testing, the table on the MHU lift truck starts to tilt without changing the position on the control valve. What is the probable cause?
- A.
Tilt cylinder leak
- B.
Azimuth cylinder leak
- C.
Latitudinal cylinder leak
- D.
Longitudinal cylinder leak
Correct Answer
A. Tilt cylinder leakExplanation
The probable cause for the table on the MHU lift truck to tilt without changing the position on the control valve is a tilt cylinder leak. This means that there is a leak in the cylinder responsible for controlling the tilt of the table, causing it to tilt unintentionally.Rate this question:
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- 24.
While lowering the MJ-1B lift truck cradle assembly, you notice one lift arm lowers slower than the other. What is the probable cause?
- A.
System pump failure
- B.
Overcenter valves out of adjustment
- C.
Counterbalance valve out of adjustment
- D.
Lift arm cylinder relief valve out of adjustment
Correct Answer
B. Overcenter valves out of adjustmentExplanation
The probable cause for one lift arm lowering slower than the other is that the overcenter valves are out of adjustment. These valves are responsible for maintaining the balance and stability of the lift arm during operation. If they are not properly adjusted, it can result in uneven lowering of the lift arm. This issue can be resolved by adjusting the overcenter valves to ensure equal and synchronized movement of both lift arms.Rate this question:
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- 25.
What MJ-1B lift truck cradle movement is manually operated?
- A.
Tilt movement
- B.
Yaw movement
- C.
Lateral movement
- D.
Longitudinal movement
Correct Answer
B. Yaw movement -
- 26.
What is the probable cause when the MJ-1B lift truck engine does not start?
- A.
10 amp fuse
- B.
20 amp fuse
- C.
Low oil pressure
- D.
Neutral start switch S3 is closed
Correct Answer
B. 20 amp fuseExplanation
The probable cause when the MJ-1B lift truck engine does not start is a blown 20 amp fuse.Rate this question:
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- 27.
On the split deck maintenance platform, what controls the platform's descent rate?
- A.
Orifice fitting
- B.
Scissor assembly
- C.
Pressure switches
- D.
Two-stage lift cylinders
Correct Answer
A. Orifice fittingExplanation
The orifice fitting controls the platform's descent rate on the split deck maintenance platform. An orifice fitting is a device that restricts the flow of fluid, in this case, hydraulic fluid, to regulate the speed at which the platform descends. By controlling the flow rate, the orifice fitting ensures a safe and controlled descent of the platform.Rate this question:
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- 28.
What split deck maintenance platform component establishes the maximum platform elevation?
- A.
Lift cylinders
- B.
Pressure switch
- C.
Sensor rail switch
- D.
Lower scissor wheel travel limit switch
Correct Answer
D. Lower scissor wheel travel limit switchExplanation
The lower scissor wheel travel limit switch is responsible for establishing the maximum platform elevation on a split deck maintenance platform. This switch is designed to detect and restrict the movement of the scissor wheels, preventing the platform from exceeding its safe elevation limit. By activating when the wheels reach their lowest point, the switch ensures that the platform cannot be raised any further, thus establishing the maximum elevation.Rate this question:
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- 29.
On the split deck maintenance platform, how is the platform lowered on the event of electrical failure?
- A.
Battery power operates the electric down valves
- B.
Auxiliary power operates the electric down valves
- C.
Accumulator pressure operates the down pilot check valve
- D.
The weight of the platform and scissor assembly controls descent rate
Correct Answer
C. Accumulator pressure operates the down pilot check valveExplanation
The platform on the split deck maintenance platform is lowered in the event of electrical failure by using accumulator pressure to operate the down pilot check valve. This means that even if there is a loss of electrical power, the accumulator will still have stored pressure that can be used to lower the platform safely.Rate this question:
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- 30.
What split deck maintenance platform engine switch position energizes the electric fuel pump, fuel solenoid, and regulator?
- A.
RUN
- B.
MODE
- C.
START
- D.
DRIVE
Correct Answer
A. RUNExplanation
The correct answer is "RUN." In the RUN position, the engine switch energizes the electric fuel pump, fuel solenoid, and regulator. This allows the fuel pump to deliver fuel to the engine, the fuel solenoid to control the flow of fuel, and the regulator to maintain the proper fuel pressure. The other options, MODE, START, and DRIVE, do not perform these functions.Rate this question:
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- 31.
While operating the split deck maintenance platform you realize that the platform will not lower. What is the probable cause?
- A.
Corroded battery cables
- B.
A defective control cable
- C.
Main disconnect switch ON
- D.
Engine switch in RUN position
Correct Answer
B. A defective control cableExplanation
A defective control cable could be the probable cause for the split deck maintenance platform not lowering. If the control cable is damaged or malfunctioning, it may prevent the platform from responding to the lowering command. This could be due to issues such as broken wires, loose connections, or internal damage within the cable. It is important to inspect and repair or replace the control cable to ensure proper functioning of the platform.Rate this question:
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- 32.
On the SGNSC, the auxiliary air system
- A.
Powers the booster compressor
- B.
Provides air to the feed air compressor
- C.
Provides low pressure air for pneumatic tools
- D.
Maintains 130 degreees F air temperature to prevent condensation
Correct Answer
C. Provides low pressure air for pneumatic toolsExplanation
The auxiliary air system on the SGNSC provides low pressure air for pneumatic tools. This means that it supplies air at a lower pressure to power tools that operate using compressed air.Rate this question:
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- 33.
What SGNSC components separate the nitrogen from the oxygen?
- A.
ASM1, ASM2
- B.
CYL1, CYL2
- C.
FCV1, FCV2
- D.
PS1, TS4, TS5
Correct Answer
A. ASM1, ASM2Explanation
The SGNSC components ASM1 and ASM2 are responsible for separating nitrogen from oxygen.Rate this question:
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- 34.
What causes the starter solenoid on the SGNSC to disengage during normal operation?
- A.
Alternator output
- B.
Oil pressure switch
- C.
Ignition switch released
- D.
Centrifugal switch opens
Correct Answer
A. Alternator outputExplanation
The correct answer is alternator output. During normal operation, the starter solenoid on the SGNSC disengages when the alternator output is detected. This is because once the alternator starts generating electricity, it takes over the power supply to the vehicle's electrical systems, including the starter motor. As a result, the starter solenoid is no longer needed to engage the starter motor, and it disengages to prevent unnecessary power consumption and potential damage to the solenoid.Rate this question:
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- 35.
What SGNSC component determines the speed of the nitrogen booster compressor?
- A.
Engine
- B.
End of stroke limit switch
- C.
Programmable logic controller circuit
- D.
Directional control valve cycling control relay
Correct Answer
C. Programmable logic controller circuitExplanation
The programmable logic controller circuit is responsible for determining the speed of the nitrogen booster compressor. This circuit controls and regulates the operation of the compressor by adjusting the input signals and controlling the output signals to maintain the desired speed. It monitors various parameters and uses pre-programmed logic to make necessary adjustments to maintain the optimal speed of the compressor.Rate this question:
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- 36.
During SGNSC operation, the HM2 fails to operate. What terminal connection of SW3 could be bad?
- A.
Terminal 1
- B.
Terminal 3
- C.
Terminal 4
- D.
Terminal 6
Correct Answer
C. Terminal 4Explanation
If the HM2 fails to operate during SGNSC operation, it suggests that there may be a problem with the connection at terminal 4 of SW3.Rate this question:
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- 37.
A supervisor must document an NCO's safety training on AF Form
- A.
2426
- B.
623
- C.
457
- D.
55
Correct Answer
D. 55 -
- 38.
Which form is used to report a hazardous condition?
- A.
AFTO Form 375
- B.
AF Form 457
- C.
AF Form 455
- D.
AF Form 55
Correct Answer
B. AF Form 457Explanation
AF Form 457 is used to report a hazardous condition. This form is specifically designed for reporting unsafe or hazardous conditions in the Air Force. It allows personnel to document and report any potential dangers or risks that could harm individuals or equipment. By using this form, the Air Force can take appropriate action to mitigate the hazard and ensure the safety of personnel and resources.Rate this question:
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- 39.
Who determines the length of time it is considered economically feasible to repair a piece of equipment?
- A.
Supervisor
- B.
Installation commander
- C.
Uniform repair/replacement board
- D.
Item manager and equipment specialist
Correct Answer
D. Item manager and equipment specialistExplanation
The item manager and equipment specialist are responsible for determining the length of time it is considered economically feasible to repair a piece of equipment. They have the expertise and knowledge to assess the costs involved in repairing the equipment and determine if it is more cost-effective to repair or replace it. They consider factors such as the cost of repairs, the expected lifespan of the equipment after repairs, and the availability of replacement parts. Ultimately, their decision is based on what makes the most financial sense for the organization.Rate this question:
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- 40.
The maintenance organization submits the AFTO Form 375 to
- A.
MAJCOM HQ
- B.
The item manager
- C.
The equipment specialist
- D.
The uniform repair/replacement board
Correct Answer
A. MAJCOM HQExplanation
The AFTO Form 375 is submitted by the maintenance organization to the MAJCOM HQ. This form is used to request maintenance actions, such as repairs or replacements, for equipment. The MAJCOM HQ is responsible for overseeing and coordinating maintenance activities at the major command level, so it is the appropriate entity to receive and process the AFTO Form 375. The item manager, equipment specialist, and uniform repair/replacement board may be involved in the maintenance process, but they are not the recipients of the AFTO Form 375.Rate this question:
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Mar 21, 2023Quiz Edited by
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Jan 08, 2012Quiz Created by
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